Lazily save double registers for HCallRuntime instructions within Hydrogen code stubs.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index c520cc36e5ccba2e2b9e85f10650d4a8040d2d0b..47a96a339eaf04058f32ef50dc5649f1b8b7676f 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2621,7 +2621,8 @@ void MacroAssembler::GetLeastBitsFromInt32(Register dst,
 
 
 void MacroAssembler::CallRuntime(const Runtime::Function* f,
-                                 int num_arguments) {
+                                 int num_arguments,
+                                 SaveFPRegsMode save_doubles) {
   // All parameters are on the stack.  r0 has the return value after call.
 
   // If the expected number of arguments of the runtime function is
@@ -2638,21 +2639,7 @@ void MacroAssembler::CallRuntime(const Runtime::Function* f,
   // smarter.
   mov(r0, Operand(num_arguments));
   mov(r1, Operand(ExternalReference(f, isolate())));
-  CEntryStub stub(1);
-  CallStub(&stub);
-}
-
-
-void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
-  CallRuntime(Runtime::FunctionForId(fid), num_arguments);
-}
-
-
-void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
-  const Runtime::Function* function = Runtime::FunctionForId(id);
-  mov(r0, Operand(function->nargs));
-  mov(r1, Operand(ExternalReference(function, isolate())));
-  CEntryStub stub(1, kSaveFPRegs);
+  CEntryStub stub(1, save_doubles);
   CallStub(&stub);
 }